“ It is well settled that the mortgagor of a railroad, even though the mortgage covers income, cannot be required to account to the mortgagee for earnings, while the property remains in his possession, until a demand has been made on him therefor, or for a surrender of the possession under the provisions of the mortgage. That is the effect of what was decided by this court in Railroad v. Cowdrey, 11 Wall. 459, 483. In the present case a demand was mad for the possession by the bringing of this suit, February 12, 1884, and from that time, in our opinion, the company must account. ”

“ Under these circumstances, as there are no current expense creditors claiming the fund, we are satisfied that the money is to be treated as income covered by the mortgages, and should be paid to the trustees, to be held as part of that security. ”